AQA English Lit Love and RelationshipsWatch
Help would be much appreciated as English is not my strong subject, to say the least
However, part of the issue you are faced with is the way you are percieving love. You need to open your mind slightly, love isn't confined to romance, particularly in the case of romantic poets, who frequently express love for nature or God. My perception on first glance is that he's using a love for nature and the way nature interacts with other components of nature to express, his love for another person and his wish to 'interact' with that person.
From reading the above, it seems that he is in love with somebody, who doesn't love him back or he shouldn't be in love with. Either way, in the context of the time is likely to be viewed as 'immature love', regardless of whether it is the latter or the former.
In the highly restrictive confines of GCSE I imagine what they want you to say (based on the above) is that the new love may not be reciprocated or realistic. In addition, arguably its stating its an uncontrolable emotion that isn't necessarily desireable (the poet appears to be going through some anguish).
In regard to a poem that you could use to compare this with, potentially Shakespeare's sonnet 40, or sonnet 65. If you want something from the romantic period you could use 'Dejection: An Ode' by Samuel T. Coleridge.
Either way, I suggest you leverage the internet for this, it's reemed with material for GCSE students.