I'm 22 years old as well and have been heavily researching property investing and I think that Buy-to-Let is sustainable and a good investment - even with the new government restrictions - but overall is not as beneficial as other strategies. If you want a better ROI, then you can definitely look into flipping property, or doing a HMO (House of Multiple Occupancy).
Or alternatively, if you're looking to really leverage your money and get an income, you can do a buy-refurb-refinance kinda thing, whereby your £75k deposit can be used to really leverage your money, allowing you to buy multiple homes on that same £75k, with the subsequent mortgage payments covered by having the properties rented out; so, instead of having one property bringing you in X amount of income/rent (after covering the mortgage costs), you could have several properties bringing you back that same X amount, all whilst still using that initial £75k. I'm not too interested in this myself as i'm not too focused on income-based strategies for property, but it is a very viable option. I'm also not interested in this because of the hassle it takes to be a landlord, whether its a vanilla buy-to-let, HMO or doing the buy/refurb/refinance way where you then have to do deal with multiple tenants. Either way though, you can always hire a letting agency who takes care of that for you, in return for a fee, which might be worth it at the end of the day for piece of mind. They can also deal with the hassle of finding tenants as well. Costs of repairs will nonetheless be forked out by you though.
If you wanna know a bit more about my general findings and more specifically income-based strategies for property investing then definitely drop me a message.